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== Introduction ==
{{See also|Pareto order}}
A multi-objective optimization problem is an [[optimization problem]] that involves multiple objective functions.<ref name="Miettinen1999" /><ref name="HwangMasud1979" /><ref name=hassanzadeh>{{cite journal|last1=Hassanzadeh|first1=Hamidreza|last2=Rouhani|first2=Modjtaba|title=A multi-objective gravitational search algorithm|journal=In Computational Intelligence, Communication Systems and Networks (CICSyN)|date=2010|pages=7–12}}</ref> In mathematical terms, a multi-objective optimization problem can be formulated as
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